Fix Readme
Fix Readme

* Old and incomplete `mingwbuilds` devkit information
jahanzaibbahadur/rubyinstaller,jaym/rubyinstaller,vemmaverve/rubyinstaller,haonaturel/rubyinstaller,dreamauya/rubyinstaller,auyaauya/rubyinstaller,modulexcite/rubyinstaller,shirosaki/rubyinstaller,oneclick/rubyinstaller,auyaauya/rubyinstaller,zorosteven/rubyinstaller,suvarnaraju/rubyinstaller,dreamauya/rubyinstaller,shirosaki/rubyinstaller,zorosteven/rubyinstaller,zorosteven/rubyinstaller,shirosaki/rubyinstaller,suvarnaraju/rubyinstaller,leonhooijer/rubyinstaller,modulexcite/rubyinstaller,vemmaverve/rubyinstaller,dreamauya/rubyinstaller,oneclick/rubyinstaller,auyaauya/rubyinstaller,vemmaverve/rubyinstaller,leonhooijer/rubyinstaller,haonaturel/rubyinstaller,jahanzaibbahadur/rubyinstaller,oneclick/rubyinstaller,suvarnaraju/rubyinstaller,jahanzaibbahadur/rubyinstaller,jaym/rubyinstaller,modulexcite/rubyinstaller,Rugbyman21/rubyinstaller,leonhooijer/rubyinstaller,jaym/rubyinstaller,Rugbyman21/rubyinstaller,Rugbyman21/rubyinstaller,haonaturel/rubyinstaller